<template>
    <div>
        <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数"
         type="warning" :closable="false">
        </el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类:</span>
                <!-- 选择商品分类的级联 -->
                <el-cascader
                    expand-trigger="hover"
                    :options="catelist"
                    :props="cateProps"
                    v-model="selectedCateKeys"
                    @change="handleChange"></el-cascader>
            </el-col>
        </el-row>

        <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini"
                :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <!-- 循环渲染Tag标签 -->
                        <el-tag v-for="(item,i) in scope.row.attr_vals"
                         :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                         <!-- 输入文本框 -->
                        <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)">
                        </el-input>
                       <!-- 添加按钮 -->
                        <el-button v-else class="button-new-tag"
                        size="small" @click="showInput(scope.row)">+ New Tag
                        </el-button>


                    </template>
                </el-table-column>
                    <!-- 索隐裂 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name">
                </el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" 
                        icon="el-icon-edit" @click="showEditDialog
                        (scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" 
                        icon="el-icon-delete" @click="removeParams
                        (scope.row.attr_id)">
                        删除</el-button>
                    </template>
                </el-table-column>
                </el-table>
        </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <!-- 添加属性按钮 -->
                <el-button type="primary" size="mini"
                :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
               
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                    <template slot-scope="scope">
                        <!-- 循环渲染Tag标签 -->
                        <el-tag v-for="(item,i) in scope.row.attr_vals"
                         :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                         <!-- 输入文本框 -->
                        <el-input
                        class="input-new-tag"
                        v-if="scope.row.inputVisible"
                        v-model="scope.row.inputValue"
                        ref="saveTagInput"
                        size="small"
                        @keyup.enter.native="handleInputConfirm(scope.row)"
                        @blur="handleInputConfirm(scope.row)">
                        </el-input>
                       <!-- 添加按钮 -->
                        <el-button v-else class="button-new-tag"
                        size="small" @click="showInput(scope.row)">+ New Tag
                        </el-button>
                    </template>
                </el-table-column>
                    <!-- 索隐裂 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name">
                </el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" 
                        icon="el-icon-edit" @click="showEditDialog
                        (scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" 
                        icon="el-icon-delete" @click="removeParams
                        (scope.row.attr_id)">
                        删除</el-button>
                    </template>
                </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible" width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" 
        ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="dialogVisible = false">取 消
    </el-button>
    <el-button type="primary" @click="addParams">确 定
    </el-button>
  </span>
</el-dialog>

<!-- 修改参数对话框 -->
<el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible" width="50%"
        @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules"  
        ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消
    </el-button>
    <el-button type="primary" @click="editParams">确 定
    </el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
    export default{
        data(){
            return{
                //商品分类列表
                catelist:[],
                cateProps:{
                    value:'cat_id',
                    label:'cat_name',
                    children:'children'
                },
                //级联选择框双向绑定
                selectedCateKeys:[],
                activeName:'many',
                manyTableData:[],
                onlyTableData:[],
                addDialogVisible:false,
                addForm:{
                    attr_name:''
                },
                addFormRules:{
                    attr_name:[
                        {
                        attr_name:{required:true,message:'请输入参数名称',
                        trigger:'blur'}
                    }
                ]
                },
                //控制修改对话框的显示与隐藏
                editDialogVisible :false,
                //修改的表单数据对象
                editForm:{},
                //修改表单的验证规则对象
                editFormRules:{
                    attr_name:[
                        {
                        attr_name:{required:true,message:'请输入参数名称',
                        trigger:'blur'}
                    }
                ]
                }
            
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
           async getCateList(){
             const {data:res} = await this.$http.get('categories')
             if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败!')
             }
             this.catelist = res.data
             console.log(this.catelist)
            },
            // 级联选择框选择项变化
           handleChange(){
               this.getParamsData()
            },
            handleTabClick(){
                console.log(this.activeName)
                this.getParamsData()
            },
           async getParamsData(){
                if(this.selectedCateKeys.length!==3){
                    this.selectedCateKeys = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }

                //证明选中的是三级分类
                console.log(this.selectedCateKeys)

             const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:this.activeName}
                }
                )
                if(res.meta.status!==200){
                    return this.$message.error('获取参数列表失败')
                }
                
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? 
                    item.attr_vals.split(' ') : []
                    //控制文本框显示与隐藏
                    item.inputVisible = false
                    //文本框中输入得知
                    item.inputValue=''
                })

                console.log(res.data)
                    if(this.activeName ==='many'){
                        this.manyTableData = res.data
                    }else{
                        this.onlyTableData= res.data
                    }
            },
            addDialogClosed(){
                this.$refs.addFormRef.resetFields()
            },
            addParams(){
            this.$refs.addFormRef.validate(async valid =>
            {
                if(!valid) return
            const{data:res} =   await  this.$http.post(`categories/
            ${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败！')
                }

                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            }
            )
        },
       async showEditDialog(attr_id){
            //查询单前参数信息
          const{data:res} =  await this.$http.get(`categories/${this.cateId}
            /attributes/${attr_id}`,
            {params:{attr_sel:this.activeName}
        })

        if(res.meta.status !==200){
            return this.$message.error('获取信息失败')
        }

            this.editForm = res.data
            this.editDialogVisible = true
        },
        //重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
             const{data:res} =  await  this.$http.put(`categories/${this.cateId}
            /attributes/${this.editForm.attr_id}`,{
                attr_name:
                this.editForm.attr_name,attr_sel:
                this.activeName}
                )

                if(res.meta.status !==200){
                    return this.$message.error('修改参数失败!')
                }

                this.$message.success('修改参数成功!')
                this.getParamsData()
                this.editDialogVisible =false
            })
        },
        //删除
       async removeParams(attr_id){
         const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
        ).catch(err => err)
        //用户取消了删除操作
        if(confirmResult !=='confirm'){
            return this.$message.info('已取消删除')
        }

        //删除的业务逻辑
       const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/
        ${attr_id}`)

        if(res.meta.status!==200){
            return this.$message.error('删除参数失败')
        }

        this.$message.success('删除参数成功!')
        this.getParamsData()

        },
        // 文本框失去焦点
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //如果没有return，则证明输入的内容需要后续处理
            row.attr_vals.push(row.inputValue.trim()
            )
            row.inputValue = ''
            row.inputVisible = false
            //需要发起请求，保存这次操作
          this.saveAttrVals(row)
        },
        //将对attr——vals 的操作，保存到数据库
       async saveAttrVals(row){
            //需要发起请求，保存这次操作
          const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/
            ${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })

            if(res.meat.status!==200){
                return this.$message.error('修改参数失败')
            }

            this.$message.success('修改参数项成功!')
        },
        //点击按钮展示文本输入框
        showInput(row){
            row.inputVisible = true
            //让文本框自动获得焦点
            this.$nextTick(_ =>{
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
        computed:{
            isBtnDisabled(){
                if(this.selectedCateKeys.length!==3){
                    return true
                }
                return false
            },
            cateId(){
                if(this.selectedCateKeys.length ===3){
                    return this.selectedCateKeys[2]
                }
                return null
            },
            titleText(){
                if(this.activeName ==='many'){
                    return '动态参数'
                }
                return '静态属性'
            }
        }
    }
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0,
}

.el-tag{
    margin:10px
}
.input-new-tag{
    width:120px;
}
</style>